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If looked after, they should last quite some time. The problem is often with the prefilters, mainly the carbon block one. That removes the chlorine from the water. Chlorine destroys membranes. I swear by Fiberdyne carbon block filters.

The first set of 150 GPD membranes lasted me 6 years. The membrane in my 4040 is nearly 4 years old and still producing pure at 98% which is the same as when it was new.

Member

If looked after, they should last quite some time. The problem is often with the prefilters, mainly the carbon block one. That removes the chlorine from the water. Chlorine destroys membranes. I swear by Fiberdyne carbon block filters.

The first set of 150 GPD membranes lasted me 6 years. The membrane in my 4040 is nearly 4 years old and still producing pure at 98% which is the same as when it was new.

A 4040 membrane is around £225 - £245.00.

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Yeah, mine has been okay, but the cold weather, froze it up and the end of the membrane housing blow off because the water turned into ice and expanded and broke it.